package WeiXin;

import java.security.MessageDigest;

public class MD5Util {
	 private static String byteArrayToHexString(byte b[]) {
	        StringBuffer resultSb = new StringBuffer();
	        for (int i = 0; i < b.length; i++)
	            resultSb.append(byteToHexString(b[i]));

	        return resultSb.toString();
	    }

	    private static String byteToHexString(byte b) {
	        int n = b;
	        if (n < 0)
	            n += 256;
	        int d1 = n / 16;
	        int d2 = n % 16;
	        return hexDigits[d1] + hexDigits[d2];
	    }

	    public static String MD5Encode(String origin, String charsetname) {
	        String resultString = null;
	        try {
	            resultString = new String(origin);
	            MessageDigest md = MessageDigest.getInstance("MD5");
	            if (charsetname == null || "".equals(charsetname))
	                resultString = byteArrayToHexString(md.digest(resultString
	                        .getBytes()));
	            else
	                resultString = byteArrayToHexString(md.digest(resultString
	                        .getBytes(charsetname)));
	        } catch (Exception exception) {
	        }
	        return resultString;
	    }

	    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
	            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

	
}
